<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>sessionStorage</title>
</head>
<body>
    <h2>sessionStorage</h2>
    <button onclick="saveData()">点我保存一个数据</button>
    <br>
    <button onclick="readData()">点我读取一个数据</button>
    <br>
    <button onclick="deleteData()">点我删除一个数据</button>
    <br>
    <button onclick="deleteAllData()">点我清空一个数据</button>

    <script>
        let p = {
            name:"张三",
            age:18
        }

        function saveData(){
            sessionStorage.setItem("msg","hello");
            sessionStorage.setItem("msg2",666);
            sessionStorage.setItem("person",JSON.stringify(p));
        }

        function readData(){
            console.log(sessionStorage.getItem("msg"));
            console.log(sessionStorage.getItem("msg2"));
            const result = sessionStorage.getItem("person");
            console.log(JSON.parse(result));
        }

        function deleteData(){
            sessionStorage.removeItem("msg");
        }

        function deleteAllData(){
            sessionStorage.clear();
        }
    </script>
</body>
</html>